Defensively verify that Symbol.for is available (#2009)

closes #2007
graphql · Jul 3, 2019 · cbd5c95 · cbd5c95
1 parent 16db20c
commit cbd5c95
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/jsutils/nodejsCustomInspectSymbol.js b/src/jsutils/nodejsCustomInspectSymbol.js
@@ -1,7 +1,7 @@
 // @flow strict
 
 const nodejsCustomInspectSymbol =
-  typeof Symbol === 'function'
+  typeof Symbol === 'function' && typeof Symbol.for === 'function'
     ? Symbol.for('nodejs.util.inspect.custom')
     : undefined;